Flows are classified as RTP if 6 following packets containing the
same SSRC field are received before TIMEOUT seconds.
If not, flow is not classified. Once a flow is classified, it can
be cancelled if no more packets (with the same SSRC value) are
received for TIMEOUTRTP seconds.
(TIMEOUT = 2 seconds, TIMEOUTRTP = 30 seconds).
RTP packets get out from output port 0, others from output port 1.
RTPClassifier[0]-> RTP traffic
RTPClassifier[1]-> non-RTP traffic *